Some concerns are the strengtheners and what backs up the dam if it breaks.
The environmental impact, including flooding, affecting local wildlife, and potential new traffic is one major concern. Another would be finding a way to provide for the power needs of the growing population.
Dams disrupt a river's ecosystem.
Hydroelectric dams.
Man-made dams provide a major source of hydroelectric power in North Africa.
believe it or not hydroelectric dams do affect the environment.
2 hydroelectric dams in south Africa
Singapore does not use hydroelectric dams to generate electricity.
Hydroelectric is ultimately solar power. The water that powers the dams is brought in from the ocean by solar evaporation that returns to the earth in the form of rain or snow. Aside from the costs (not just money but also environmental) of building dams, hydroelectric power is free for the taking.
hydroelectric dams
Tennessee Valley Authority
yes
Hydroelectric power